Plastic-block machine.



No. 779,775. PATENTED JAN. 10, 1905. A. EVENSTAD PLASTIC BLOCK MACHINE.

APPLICATION FILED MAY 12. 1904.

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PLASTIC BLOCK MACHINE.

APPLIUATION FILED MAY 12. 1904.

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5'5 WITNESSES:

uv VENTOH uynion Even alad A TTOHNE No. 779,775. PATENTBD JAN. 10, 1905. A. EVENSTAD.

PLASTIC BLOCK MACHINE.

APPLICATION rum)v MAY 12. 1904.

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E E- El 1 1 j WITNESSES; /NVENT0R C a 25071, Ev'enJZacZ Patented January 10, 1905.

PATENT OFFICE.

ANTON EVENSTAD, OF LAKOTA, NORTH DAKOTA.

PLASTIC-BLOCK MACHINE.

SPECIFICATION forming part of Letters Patent N 0. 779,775, dated January 10, 1905. Application filed May 12, 190 Serial No- 207,542.

To (,tZZ whmn it may concern.-

Be it known that I, 'ANTON EVENSTAD, a citizen of the United States, and a resident of Lakota, in the county of Nelson and State of North Dakota, have invented a new and Improved Plastic-Block Machine, of which the following is a full, clear, and exact description.

My invention relates to a machine for molding blocks of concrete, clay, or any other plas' tic material. While it is capable of use for molding various articles, it is especially adapted for molding hollow building-blocks.

The objects of the invention are to secure the ready and accurate opening of the mold by a simple operation, at the same time providing for entirely removing the mold from the article produced, and also providing a very simple, cheap, and easy manner of constructing the bottom plates and guiding the cores.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 represents a plan view of a preferred form of my invention with the mold and cores in place. Fig. 2 is a similar view with the mold removed. Fig. 3 is also a view similar to Figs. 1 and 2, with the mold, bottom plate, and cores removed. Fig. 4 is a sectional view on the line 4 4 of Fig. 1. Fig. 5 is a perspective view showing the manner of attaching the cores to the core-plate. Fig. 6 is a horizontal sectional view of a modification of a mold, showing a means of adjusting the dimensions thereof. Fig. 7 is a perspective view of a detail shown in Fig. 6. Fig. 8 is a perspective view of the mold, its supports, and operating devices, showing a second position of the parts in dotted lines. Fig. 9 is an end view of the device shown in Fig. 1. Figs. 10 and 11 are diagrammatic views showing special forms of molds which may also be used and which come within the scope of my invention, and Fig. 12 is a plan view of the bottom plate.

The drawings, which represent one construction in which my invention may be embodied, show it as applied to the manufacture of hollow building-blocks.

11 represents the frame of the machine, which is provided with a surrounding frame 11 at the top and longitudinal bars 11 at the bottom. The frame 11 is provided with crossbars 11. This frame is intended to support all the other parts of the machine.

12 is a frame which is pivoted to the upper part of the main frame at 12 and is intended to support the main parts of the mold. Upon this frame is a strip 13, pivoted to it at 14, and a second strip 15 is pivoted to the frame 12 at 16 and connected to the strip 13 by means of a pivoted link 17. At one end of the strip 13 is alink 18, pivoted to the strip and to the hand-lever 19, which in turn is pivoted to the side of the frame 12 or to any other convenient part of the device. This hand-lever 19 is provided with an extension adapted to be gripped by the hand in order to operate the device. 20 is a third strip which is pivoted to the frame 12 at the point 21 and is connected to the strip 13 by means of a pivoted link 22. The strips 15 and 20 are provided with brackets 23, which are adapted to hold the mold, which is preferably composed of two sections 24 and 25, connected together at their opposite corners. One of these sections is held by the strip 15 and the other by the strip 20, so that when the strips are separated the mold parts will also be separated in the manner shown in dotted lines in Fig. 8. Seats 24 25, Fig. 11, may be cut out of the sections to receive the short ends to keep the mold from springing when the material is tamped in it. The operation of separating the parts simply consists in raising the hand-lever 19 aboutits pivot, and thereby pulling the three strips into the positions shown in dotted lines in Fig. 8. It will be seen that this operation will entirely separate the mold from the article produced and that it can be removed from the vicinity of the article by swinging the whole frame 12 upward upon its pivot 12.

The form of mold illustrated in Fig. 8 is obviously not the only form which can be used in this machine. In Fig. 10 amold with of the cores and injuring them.

a reentrant angle is formed by the side 24 for the purpose of forming a corner-block with a removable cross-piece 26 having longitudinal pieces 27 27 for the purpose of forming similar blocks within the one which would be formed in the mold without these pieces. In Figs. 6 and 7 are shown two pieces 28, used for the purpose of lengthening the sides or ends of the mold, so as to increase the size of the block produced. These pieces are preferably provided with one or more pins 29, adapted to enter holes in the ends of the wall to which they are to be attached, and are also provided with an outside strip 30 for protecting the joint and keeping the parts in position. A hole 31 is also provided for the purpose of securing these parts together by means of a pin, rivet, or equivalent device.

Referring now to Figs. 1, 2, 4, and 12, 32 represents a bottom plate provided with openings 33 for the purpose of receiving cores 34. These cores 34 are each mounted upon or are integral with a plate 35, which virtually constitutes a projection on each of the cores at the bottom. In one of these projections is provided a slot 36 for receiving a bolt 37; in the other is provided a hole for receiving a similar bolt 38. One or more cores are preferably secured to a core-plate 39, which is provided with a series of holes 40 for receiving the bolts 37 and a series of slots 41 for receiving the bolts 38. This construction is shown in Fig. 5. It will be seen that the cores can be placed in any of the positions indicated by the holes and slots 40 41, respectively, and also that the cores may be adjusted transversely of the core-plate 39 on account of'the provision of the slots 36 and 41. The core-plate is operated by means of the following connections: A link 42 is pivoted to the bottom of the core-plate, and this link in turn is pivoted to a pivoted lever 43, which is adapted to be secured in position by means of a hook or similar device 44.

The operation of the device will be obvious. When the cores are lifted to the position shown in Fig. 4, the material for forming the blocks may be placed in the mold and tamped in the ordinary manner. The cores may be made to project above the top of the mold, if desired, as shown, for the purpose of permitting the tamping operation to be performed without somuch danger of striking the tops After the tamping is completed the cores are lowered, so that their tops are flush with the top of the mold, and the top surface of the plastic material is smoothed off by means of a trowel. Duringthis operation the cores will obviously cause the material to be retained in the desired position, and after it is completed the cores may be withdrawn by operating the lever 43. Then the mold is manipulated, as described above, in order to assume the posi- 5 tion shown by dotted lines in Fig. 8, and

finally the frame 12 is swung upwardly on its pivot, and the molded block is thus left on the bottom plate 32 and may be readily removed.

While I have described a particular embodiment of my invention, it will be obvious that it is not limited to the exact construction shown, but that many modifications may be made therein without departing from the spirit thereof as set forth in the appended claims.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent 1. A molding-machine comprising a frame, a pair of strips pivoted to said frame, a moldsection connected with each strip, a third strip pivoted to said frame and connected to said first-mentioned strips, whereby movement of the third strip will be transmitted to said pair of strips, and means for oscillating said last-mentioned strip.

2. A molding-machine comprisinga pair of strips each pivoted at one end, a mold-section connected with each of said strips, a third pivoted strip, a connection from the free end of each of said first mentioned strips to said third strip, and means for oscillating said third strip on its pivot.

3. A molding-machine comprising a pair of strips pivoted at opposite ends thereof, a moldsection connected with each strip, a third pivoted strip, and a link pivoted to said last-mentioned strip at each end thereof and pivotally connected to each of said first mentioned strips at the free ends thereof.

4. A molding-machine comprising a pair of pivoted strips, a mold-section connected with each strip, a third pivoted strip, connections from said third strip to each of said other strips, a link pivoted to said last-mentioned strip, and a pivoted operating-lever connected with said link.

5. A molding-machine comprising a pair of pivoted strips, a mold-section comprising a side and end secured to each strip, a third piv oted strip, connections from the opposite ends of said third strip to each of said other strips, a link pivoted to said last-mentioned strip, and a pivoted operating-lever connected to said link.

6. A molding-machine comprising a frame, a pair of strips pivoted to the frame on opposite sides thereof, a molding-section mounted on each of said strips, and means for simultaneously swinging said strips on their pivots in opposite directions.

7 A molding-machine comprising a frame, a pair of strips pivoted to the frame on opposite sides thereof, a molding-section mounted on each of said strips, and means for simultaneously swinging said strips on their pivots in opposite directions; said means comprising a third strip pivoted near its center to the frame, a link connecting one end of the third strip to the free end of one of the other strips, a link connecting the other end of the third strip to the free end of the other strip, and means for oscillating said third strip on its pivot.

8. A molding-machine comprising a pair of sections constituting a mold, each of said sections comprising a side and end of the mold and being separable at opposite corners thereof, and lengthening-pieces for the Walls of said sections, said lengthening-pieces being provided with projections adapted to enter holes in the Walls of said mold-sections.

9. A molding-machine, comprising a mold the opposite sides of Which are pivoted at fixed points, a pivoted strip, and two links, one connected with each of said mold sides and with said strip at points on opposite sides of its pivot.

10. A molding-machine, comprising a pair of strips pivoted at stationary points, a moldsection connected with each strip, a third pivoted strip, and means connected With said third strip at opposite sides of its pivotal point and also connected with the first-mentioned strips for simultaneously oscillating the firstmentioned strips when the third strip is moved on its pivot.

11. A molding-machine, comprising a pair of strips capable of assuming a parallel position with respect to each other and pivoted near opposite ends, in combination with a mold-section mounted on each strip, and means for simultaneously swinging the strips in opposite directions about their pivots.

12. The combination with a support, of two L-shaped sections which constitute the side and end of a mold, and means for pivoting each section to the support at a point beyond a free end of the section and substantially in line with one of the portions of the section, said pivotal points being located beyond the opposite corners of the mold.

' In testimony whereof I have signed my name to this specification in the presence of tWo subscribing Witnesses.

ANTON EVEN STAD.

Witnesses:

P. J ORGONSON, G. G. FINLAY. 

